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As a construction engineer for a city, you are responsible for ensuring that the company that is providing gravel for a new road puts as much gravel in each truckload as they claim to. It has been estimated that it will take 500 truckloads of gravel to complete this road, so you plan to measure the volume of gravel in an SRS of 25 trucks to make sure that the company isn't delivering less gravel per truckload than they claim. Each truckload is supposed to have 20 m3of gravel, so you will test the hypothesis H0: μ = 20 versus Ha: μ < 20.
Describe what a Type I error is in this context.
Determine the distribution of X? Determine its parameters?
in exponential smoothing models the value of the smoothing constant may be any number between .a -1 and 1b -5 and 5c 0
the macburger restaurant chain claims that customers mean waiting time is 3 minutes. the quality assurance department
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
The time required to do the job is normally distributed and has a mean time of 28 minutes with a standard deviation of 5 minutes. How much time should the employer allow employees to finish the job?
What is the probability that none of them has lost electricity in his/her household? Assume that their locations are spread out so that loss of electricity is independent among their households.
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively;
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
What does confidence interval tell you? What does it mean? What 2 things can a researcher do to decrease width of a confidence interval? What are the effects?
What might you conclude from examining the differences in the mean, median and mode for these three data sets? For data set three, which measure of central tendency is the least appropriate? The most appropriate?
online service usage you are a travel agent and wish to estimate with 97 confidence the proportion of vacationers who
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